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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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Flags cleanup.
Basically the purpose of this commit is to move more of the compiler's
global state into DynFlags, which is moving in the direction we need
to go for the GHC API which can have multiple active sessions
supported by a single GHC instance.
Before:
$ grep 'global_var' */*hs | wc -l
78
After:
$ grep 'global_var' */*hs | wc -l
27
Well, it's an improvement. Most of what's left won't really affect
our ability to host multiple sessions.
Lots of static flags have become dynamic flags (yay!). Notably lots
of flags that we used to think of as "driver" flags, like -I and -L,
are now dynamic. The most notable static flags left behind are the
"way" flags, eg. -prof. It would be nice to fix this, but it isn't
urgent.
On the way, lots of cleanup has happened. Everything related to
static and dynamic flags lives in StaticFlags and DynFlags
respectively, and they share a common command-line parser library in
CmdLineParser. The flags related to modes (--makde, --interactive
etc.) are now private to the front end: in fact private to Main
itself, for now.
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